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xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 1 features ? operation voltage from 8v to 40v ? adjust vout from 1.25v to vin-2v ? minimum drop out 0.3v ? fixed 180khz switching frequency ? maximum 3a switching current ? internal optimize power mosfet ? excellent line and load regulation ? with output constant current loop ? built in thermal shutdown function ? built in current limit function ? built in output cable compensation ? recommend output power less than 13w ? sop8-ep (exposed pad) package applications ? car charger ? battery charger ? lcd monitor and lcd tv ? portable instrument power supply ? telecom / networking equipment ? buck constant current driver general description the xl4301 is a 180khz fixed frequency pwm buck (step-down) dc/dc converter, capable of driving a 2.5a load with high efficiency, low ripple and excellent line and load regulation. requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator. the pwm control circuit is able to adjust the duty ratio linearly from 0 to 100%. an enable function, an over current protection function is built inside. an internal compensation block is built in to minimize external component count. the xl4301 built in a simple, user-programmable output cable voltage drop compensation function. use the curve in table 2 to choose the proper compensation resistance values for cable compensation. figure1. package type of xl4301
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 2 pin configurations figure2. pin configuration of xl4301 (top view) table 1. pin description pin number pin name description 1 nc not connected. 2 sw power switch output pin (sw). ou tput is the switch node that supplies power to the output. (note: connected the back exposed pad to sw .) 3 gnd ground pin. 4 fb feedback pin (fb). through an external resistor divider network, feedback senses the out put voltage and regulates it. the feedback threshold voltage is 1.25v. 5 cs output current sense pin (iload=0.11v/rcs). 6 lc output cable compensation. 7 vc internal voltage regulator bypass capacity. in typical system application, the vc pin connect a 1uf capacity to vin. 8 vin supply voltage input pin. xl4301 operates from a 8v to 40v dc voltage. bypass vin to gnd with a suitably la rge capacitor to eliminate noise on the input. the back exposed pad is sw.
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 3 function block figure3. function block diagram of xl4301 typical application circuit (car charger) figure4. xl4301 typical a pplication circuit
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 4 ordering information order information marking id package type packing type supplied as xl4301 XL4301E1 sop8-ep 2500 units on tape & reel xlsemi pb-free products, as designated with ?e1? suffix in the par number, are rohs compliant. absolute maximum ratings note1 parameter symbol value unit input voltage vin -0.3 to 45 v fb pin voltage v fb -0.3 to vin v sw pin voltage v sw -0.3 to vin v power dissipation p d internally limited mw thermal resistance (junction to ambient, no heatsink, free air) r ja 60 oc/w maximum junction temperature t j -40 to 150 oc operating junction temperature t j -40 to 125 oc storage temperature t stg -65 to 150 oc lead temperature (soldering, 10 sec) t lead 260 oc esd (hbm) >2000 v note1: stresses greater than those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those in dicated in the operation is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability.
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 5 xl4301 electrical characteristics t a = 25 ;unless otherwise specified. symbol parameter test condition min. typ. max. unit system parameters test circuit figure4 vfb feedback voltage vin = 8v to 40v, vout=5v iload=0.2a to 2a 1.231 1.25 1.269 v efficiency ? vin=12v ,vout=5v iout=2.5a - 88 - % electrical characteristics (dc parameters) vin = 12v, gnd=0v, vin & gnd parallel connect a 100uf/50v capacitor; iout=500ma, t a = 25 ; the others floating unless otherwise specified. parameters symbol test condition min. typ. max. unit vin operation voltage vin 8 40 v vin uvlo vuvlo 5 v quiescent supply current i q v fb =vin 2 5 ma oscillator frequency fosc 153 180 225 khz switch current limit i l v fb =0 3.5 a output power pmos rdson v fb =0v, vin=12v, i sw =3a 75 100 mohm constant current sense voltage v cs 104.5 110 115.5 mv thermal shutdown temperature otp 165 oc thermal shutdown hysteresis 40 oc
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 6 typical system application (car charger) figure5. xl4301 system parameters test circuit (vin=8v~40v, vout=5v/0.1a~2.5a) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 output voltage vs output current output voltage(v) output current(a) vin=8v,vout=5v,iout=0.1a~2.8a vin=12v,vout=5v,iout=0.1a~2.8a vin=24v,vout=5v,iout=0.1a~2.8a vin=36v,vout=5v,iout=0.1a~2.8a 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 40 45 50 55 60 65 70 75 80 85 90 95 100 efficiency vs output current efficiency(%) output current(a) vin=8v,vout=5v,iout=0.1a~2.5a vin=12v,vout=5v,iout=0.1a~2.5a vin=24v,vout=5v,iout=0.1a~2.5a vin=36v,vout=5v,iout=0.1a~2.5a figure6. output constant current curve figure7. efficiency curve 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 output voltage vs output current output voltage(v) output current(a) vin=8v,vout=5v,iout=0.1a~2.5a vin=12v,vout=5v,iout=0.1a~2.5a vin=24v,vout=5v,iout=0.1a~2.5a vin=36v,vout=5v,iout=0.1a~2.5a -50 -25 0 25 50 75 100 125 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 '&&%#"$,70-5"(&$)"/(&745&.1&3"563& '&&%#"$,70-5"(&$)"/(&
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7*/7 70657 *065" /psnbmj[febu5" figure8. line&load regulation curve figure9. feedback voltage curve
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 7 typical system application (car ch arger, output cable loss compensation) figure10. xl4301 system parameters test circuit (vin=8v~40v, vout=5v/0.1a~2.5a) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 output voltage vs output current output voltage(v) output current(a) 7*/7 70657 *065"_" 3, 7*/7 70657 *065"_" 3, 7*/7 70657 *065"_" 3, 7*/7 70657 *065"_" 3? figure11. output cable loss compensation curve
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 8 table 2.compensation resist or(r3) and rcs selection iout(a) output cable loss compensation percent r3(k ? ) rcs(m ? ) 0 floating 91 1% 105 92 5% 17.2 95.3 1 10% 7 100 0 floating 47.8 5% 49.9 50 2.1 10% 8.2 52.3 0 floating 42.3 5% 23.7 43.2 2.4 10% 8.98 45.5 schottky diode selection table current surface mount through hole vr (the same as system maximum input voltage) 20v 30v 40v 50v 60v 1a ? 1n5817 1n5818 1n5819 ? 1n5820 1n5821 1n5822 ? mbr320 mbr330 mbr340 mbr350 mbr360 ? sk32 sk33 sk34 sk35 sk36 ? 30wq03 30wq04 30wq05 ? 31dq03 31dq04 31dq05 3a ? sr302 sr303 sr304 sr305 sr306 ? 1n5823 1n5824 1n5825 ? sr502 sr503 sr504 sr505 sr506 ? sb520 sb530 sb540 sb550 sb560 ? sk52 sk53 sk54 sk55 sk56 5a ? 50wq03 50wq04 50wq05
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 9 package information (sop8-ep)
xlsemi datasheet 3a 180khz 45v buck dc/dc converter with constant current loop xl4301 rev1.0 www.xlsemi.com 10 important notice xlsemi reserve the right to ma ke modifications, enhancements, improvements, corrections or other changes without notice at any time. xlsemi does not assume any liability arising out of the application or use of any product describe d herein; neither does it convey any license under its patent rights, nor the rights of others. xlsemi assumes no liability for applications assistance or the design of buyers? produc ts. buyers are responsible for their products and applications using xlsemi components. to minimize the ri sks associated with buyers? products and applications, buyers should provide adequate design and operating safeguards. xlsemi warrants performance of its produc ts to the specificati ons applicable at th e time of sale, in accordance with the warranty in xlsemi?s term s and conditions of sale of semiconductor products. testing and other quality control tec hniques are used to the extent xlsemi deems necessary to support this warranty. except where mandated by ap plicable law, testing of all parameters of each component is not necessarily performed. for the latest product information, go to www.xlsemi.com.

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